前兆 auspice ; [地震] Precursor ; premonition ; forerunner

地震前兆 [地震] earthquake precursor ; omen of earthquake ; precursory information of earthquake

火山喷发前兆 forerunning phenomena ; eruption symptom

成为前兆的 predictive

预防防止前兆 preclude

前兆异常 precursory anomaly ; precursory anomalies

前兆性自愈技术 Predictive Self-Healing

前兆的 portentous ; prophetical

成为前兆 foreshadow

前兆现象 forerunning phenomena